/Engine/Source/Runtime/CoreUObject/Public/UObject/Object.h
Uses the TArchiveObjectReferenceCollector to build a list of all components referenced by this object which have this object as the outer
void CollectDefaultSubobjects ( [TArray](API\Runtime\Core\Containers\TArray)< [UObject](API\Runtime\CoreUObject\UObject\UObject) * > & OutDefaultSubobjects, bool bIncludeNestedSubobjects ) const